SOLUTION: During one month, a homeowner used 300 units of electricity and 140 units of gas for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas were use
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Question 1179778: During one month, a homeowner used 300 units of electricity and 140 units of gas for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas were used for a total cost of $112.50. Find the cost per unit of gas. Found 2 solutions by josgarithmetic, ikleyn:Answer by josgarithmetic(39616) (Show Source):
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During one month, a homeowner used 300 units of electricity and 140 units of gas
for a total cost of $106.20. The next month, 250 units of electricity and 250 units of gas
were used for a total cost of $112.50. Find the cost per unit of gas.
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Write equations as you read
300E + 140G = 106.20 (1)
250E + 250G = 112.50 (2)
You need find G. Use the determinant method (the Cramer's rule)
G = = 0.18 dollars. ANSWER
Solved.
Do not be scared seeing this long formula filled with numbers.
You can get the answer in ONE CLICK copying this formula into the Excel spreadsheet
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